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G. R. MEISSYNER. SPARK-PLUG INENsIFl'ER. APPLICATION F'ILED APR. 29,'1'918.

1,31 0,427. Patented July 22, 1919.

PATENTS taiihlthl.

GEORGE RICHARB MEISSNER, OF DEXTER, IOWA.

SPARK-PLUG- INTENSIFER.

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Specification of Letters Patent.

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Application led April 29, 1913. Serial No. 231,497.

.To all 107mm t may concern:

Be it known that I, GEORGE RICHARD Mnissnnn, a citizen of the United States of America, and resident of Dexter, Dallas county, iowa, have invented new and useiul Sparklug lntensiliers, of which the following' is a specification.

This invention relates to and is an improvement on the structure defined in Letters Patent Number 1,259,893 granted to mc March' 19, 1918, and has for its object the provision of means for sealing against moisture and atmospheric air the spark chambers of a spark gap device.`

A further object of this invention is to provide separate, yet electrically communieating, spark chambers or cavitiesin a transparent member in a spark gap device.

A further object of this invention is to provide improved means for mounting screw conductors in a spark gap device.

further object of. this invention is to provide improved means for .mounting a screw conductor in a spark gapdevice partitioned from a spark chamber or cavity of said device.

A further object of this invention is to provide means for producing twin sparks simultaneously in a spark gap device.

A. further object of this invention is to provide n'ieans for producing twin sparks simultaneously in a spark gap device, the gap in which one of said sparks is produced being,r adjustable.

My invention consists in the construction', arrangement and combination of elements hereinafter set forth, point-ed out in my Vclaims and illustrated by the accompanying thawing, in which Y Figure 1 is a pla-n, partly in section` illustrating my improved construction in connectionfwith one end portion of a horn of com- -fmon lform. Fig. 2 is azcrosssection on the yet separated spark chambers or cavities 11, 12. The spark chambers or cavities 11, 12 are spaced apart at their inner ends by a partition 13 of glass integral and homogeneous with the body ot' the insulator and a contact member or electrical bridge 1+ preferably made of metal of high conductivity, is located centrali f of, extends through and is headed at opposite ends on said partition, preferably by molding in thc insulator in the operation of manufacturing. lhe insulator l prcierably 1s formed with curved rims or annular outwardly convex l'ianges 15, 16 on its ends. Caps 17, 18, preferably made of metal of high conductivity by. stamping, pressing, drawing or spinning, are mounted on end portions of the insulator and sealing devices, such as'paper washers 19, 20, are interposed be! tween the caps 17, 18 and the ends and flanges of the insulator 10 and the. flanges of said caps are rolled or spun upon the clamp marginal portions of the sealing devices in sealing relations to said peripheries.

The cap 17 is formed with a closed socket 21 in its central portion adapted to be eX- tended within and iit snugly the spark chamber 11, and said socket terminates at its inner end in a semi-spherical Contact point 22 having its apex contiguous to yet spaced from one end ot the contact member vor bridge 14.. By this means the spark chamber 11 is sealed against admission thereto of atmospheric air or moisture. A connecting member 23 is screwed into the socket meinber 21 and is adapted to be secured (see my former patent above noted) to a spark plug or other electrical device. t will be observed that the inner end portion ot the connecting device 23 is inner end of the socket from the spark chamber 11, thus avoiding-any communication other than electrical between -said members. The cap 18 is formed with a socket member 24 at its center extending within and fitting snugly to the spark chamber 12, which socket member is -open at its inner end. An electrode 25 formed as a screw of metal of highconductivity is screwed into the socket 24 and is formed with a projecting core or point 26 adapted for contact with orspacing from the adjacent head of the contact member or bridge 14. The electrode 25 is formed with a korf 26l in its vouter end adapting it for rotation ley-means of a screw driver-or other partitioned by the is provision preferably vis tion by'amillednutBO screwed on said'eiectrede.

vents passage of atmospheric air 0r moisture between the Q siones tool. A lock nut 2'? is screwed on the elecn trede 25 and is adapted to engage the-outer falce of the cap 18 and lock said electrode against accidental rotation. A conductor such as a horn 28 inay'lbe connected'by a terminal'29 to ,the electrode 25 and said ter# secured 'in' contact rela- 'lhe scaling; device 2Gedectually`precap 18 and insulator 10 and the screw of the electrode 25, mating with I afcorrespondlng screw 1n the socket 2d, in .like inanner xrevents the passage of atmosmoisture between them. Thus made for sealing the spark hamber or cavity 12 against external -inluences.

Through the use of two spark chambers or cavities 11, 12 andthe devices mounted theren in as shown, twin sparks may be produced, the gap for one spark being adjusted by adjustment of the electrode 25. These sparks or either of them are readily'visible through pheric iai r' an the material .of the insulator, thus guiding' the operator in making such adjustments as may be indicated. Experiment has demonstrated that enlarging the gap between the ,electrode 25 and brige le, Within reasonable limits, intensifies the spark delivered at the spark plug gap and such result is desirable on many occasions, such as low temperature7 certain conditions of humidity,the use of relatively heavy grades of fuel oil, or -fouiness of spark plugs occasioned by carbon, oil or grease.

I claim las 1ny-inventionl. A spark plug intensifier, comprising anv l insulator formed with separate electrically sockets extending Within said spark chariv connected spark chambers, eaps at both ends of the insulator, said caps being` formed with sockets extending Within said spark chainbers, and electrodes at both ends ot the iii.-

sulator, which electrodes are scoured in said sockets.

2. A spark plug intensifier, comprising an insulator formed with separate eleetrieaily `connected spark chambers, caps at both ends of the insulator, said caps being;r formed with here, one of said sockets being open its l i l l i Ji.

ner end, and eiectrodes at both ends insulator, Wf'liich electrodes secured said sockets. i

, 3. A spark ping intensier, comprising au insulator formed with separate eiectricaig' connected spark chambers, 'capsat both ends of said insulator, said caps being 'formed' 'with sockets extending 1:rithin said chambers, one of said sockets 4openA at its inner end, and eiectrodes'at both of the insulator, which electrodes are se` cured in said sockets, the other of said lsock-A ets'terminating in ,a contact point adiacent to one endv of the electrical connection he tween said spark chambers.` v

i. A spark plug intensifier, comprising an insulator formed with 'separate eiec'tricaliy connected spark chambers, capsat both 'ends of the insulator, said caps being termed with sockets extending within `said spark chainbers, electrodes at both ends ci the insulated' which electrodes are secured in said'scckets,

and sealing Washers interposed between saidcaps .and 1nsulator. v

5. A spark plug intensier, comprising an insulator formed With separate eiectricalljf with sockets extending Within said chambers, and electrodes at both ends of insulator, 'which electrodes are s-cured in said sockets, one of said electrodes being formed with a contact point at its inner and and a korf at its outer end.

Signed at Dexter., in the county of Bailes Vand State et iowa, this 16th day ci GEORGE RCHARD ME'SSH 

